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Summary of Impact of Impairment on Net Book Value of Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net Book Value Before Impairment	$ 227,839	$ 419,678
Impairment	(216,777)	(211,264)
Net Book Value After Impairment	11,062	208,414
Operating Facilities [Member]
Net Book Value Before Impairment	170,324	331,520
Impairment	(164,449)	(151,910)
Net Book Value After Impairment	5,875	179,610
Transload Locations [Member]
Net Book Value Before Impairment	23,264	86,741
Impairment	(21,815)	(59,354)
Net Book Value After Impairment	1,449	27,387
Real Estate [Member]
Net Book Value Before Impairment	1,417	1,417
Impairment	(1,367)
Net Book Value After Impairment	50	$ 1,417
Lease Right-of-Use Assets [Member]
Net Book Value Before Impairment	32,834
Impairment	(29,146)
Net Book Value After Impairment	$ 3,688

X

- Definition

Net book value after impairment of long lived assets.

+ References

No definition available.

+ Details

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- Definition

Net book value before impairment of long lived assets.

+ References

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X

- Definition

The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760

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